What two things must happen for diffusion to occur?

Answers

Answer 1

Answer: For diffusion to occur there needs to be a concentration gradient. Which means that the concentrations on the two sides must be different. In diffusion the particles flow from high concentration to low concentration.

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Which statement is NOT true about the noncyclic electron pathway? (A) Electrons are boosted to higher energy level in Photosystem I.(B) Sunlight excites electrons in Photosystem II.(C) It produces ATP.(D) It produces NADPH.(E) It produces carbohydrates through carbon dioxide fixation.

Mimulus lewisii and Mimulus cardinalis are two plants that occupy the same habitat but do not interbreed in nature. However, they can be readily crossed in the laboratory to produce fertile offspring. Which of the following is a likely reason that prevents interbreeding of these plants in nature?A(They only reproduce by self–pollination.
B(They have incompatible gametes.
C(They show seasonal differences in flowering.

Answers

C(They show seasonal differences in flowering.

Temperature is considered a(n) _______ limiting factor.biotic
A) abiotic
B) abiotic and biotic
C) natural

Answers

Temperature is considered an biotic limiting factor. The correct answer is A.

Abiotic limiting factor

True or false Mammals use trees for both food and shelter.

Answers

This is true. An easy example is monkeys who eat food from trees, or hide there from other predators found on land that might attack them, or they live in the trees and sleep there, or hide from things like storms and bad weather. They are not the only ones and there are many mammals that do this.

Answer:

True

Explanation:

Just did the quiz

Which scientist developed the idea that microorganisms can cause diseases?Paul Ehrlich
Anton van Leeuwenhoek
Louis Pasteur
Alexander Fleming

Answers

Answer;

Louis Pasteur

Explanation;

He was French chemist, this man discovered that heat could kill bacteria that otherwise spoiled liquids including milk, wine, and bee.

He developed germ theory and pasteurization and also demonstrated the Germ Theory of Disease.

The germ theory was his idea that microorganisms might cause disease.

It met great resistance at first because for centuries disease was believed to be punishment for an individual's crimes or misdeeds.

Answer:

Explanation:

The following are quick strategies for determining the relevance of a source EXCEPTa. scanning for key words
b. reading the entire source first, circling key words
c. browsing the table of contents in a book-length source.
d.looking for language from your research questions in an index.

Answers

All of the choices given are quick strategies for determining the relevance of a source except for reading the entire source first, circling the key words. This will make the correct B.

The correct answer is option B, reading the entire source first, circling key words

Reason -

Scanning through key words is a quick strategy for determining the relevance of a source because its easy to use CTRL+F command and scan the entire document for a key just through few clicks

The index content is also a representation of the summary of the text inside the book. There is high probability that an important key word is marked in the index and thus it is easy and quick to scan an index as the text is less. Similarly, looking in table of content is also a quick process.

But reading the entire book just to find a key word is usually a tedious task.

Why do all normal cells in human body have same number of chromosomes?

Answers

The reason as to why all human body cells have the same number of chromosomes is because of the process of mitosis and meiosis.

Mitosis is the process of cell division in which body cells or somatic cells divide to yield two daughter cells with the same number of chromosomes as the parent cells. The process involves a series of steps, and results in the formation of two new nuclei each having the same number of chromosomes as the parent nucleus. The process ensures that have the same number of chromosome. In meiosis, sex cells have half the amount of chromosomes that a normal cells has and therefore when they join another, there are 46 chromosomes in the cell.

Females have two X chromosomes in their cells, while males have one X and one Y chromosome. Mitosis; before it divides it replicates & meiosis; sex cells have half the amount of chromosomes that a normal cell has so when they join another, there are 46 chromosomes in the cell.

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The mechanical and chemical receptors that control digestive activity are located ________.A. in the glandular tissue that lines the organ lumen B. in the walls of the tract organs C. in the pons and medulla D. only in the esophagus because this is the only part of the tract that needs to change to accommodate food passage